BY WALTER W. FROGGATT. 273 



Genus i. — Petalolyma, Scott, Trans. Ent. Soc. Lond. 1882, 

 p. 459. 



ii. — Bactericera, Puton, Ann. Soc. Ent. France, (5), vi., 



1876, p. 286. 

 iii.— Trichopsylla, Thompson, Opus. Ent. 1877 (f. viii.), 



p. 820. 

 iv. — Trioza, Forster. 



v.— Rhinopsylla, Riley, Proc. Biol. Soc. Washington, 



1888, p. 71. 

 vi. — Pachypsylla, Riley, I.e. 

 vii. — Neolithus, Scott, I.e., p. 445. 

 viii. — Phacopteron, Buckton, Ind. Mus. Notes, Vol. iii.. 



No. v., p. 18, 1895. 

 ix. — Parhypsylla, Riley, Canadian Entomologist, xv., 



p. 157, 1883. 

 X. — Ceropsylla, Riley, Proc. Biol. Soc. Washington, 1888. 



Genus Trioza, Forster. 



Head produced into two conical pr<icesses in front. Eyes 

 large : ocelli large. Antennae slender from 3rd joint to apex. 

 Wings : cubitus without a stalk; hind marginal nervure pro- 

 ducing three ^)ranches, of which two spring from the same point; 

 three short nervelets free on the dorsal edge of wing between the 

 fork of cubitus. 



Most of the Australian species in this subfamily appear to fit 

 very well into the Genus Trioza. The larvse of a number being 

 gall-makers, spend the earlier stages of their existence enclosed 

 in thick fleshy galls upon the foliage of different species of 

 Eucalypts. I do not know of any psyllid galls on other trees 

 than Eucalypts. Upon Tristania and Eugenia the insects form 

 curious pits and blisters and not true galls, in which the larvse 

 remain until full grown in their natural state, though firmly 

 imbedded; if the leaves are gathered too early, when they com- 

 mence to dry the larvae disconnect themselves from the leaves 

 and crawl about quite easily. 



